ATPV is defined in ASTM F1959/F1959M as the incident energy (cal/cm2) on a material or a multilayer system of materials that results in a 50% probability that sufficient heat transfer through the tested specimen is predicted to cause the onset of a second-degree skin burn injury based on the Stoll curve. EBT is defined in ASTM F1959/F1959M as the incident energy (cal/cm2) on a material or a material system that results in a 50% probability of break open.

A) 20%
B) 30%
C) 40%
D) 50%